Explain Spray Tanning like I'm a 19th Century African Slave.

Of course you know that for a white girl to have color to her skin is a sign of having worked outdoors, and therefor of being lower class. All girls - white and colored alike - strive for the porcelain skin of one who never leaves the pampered shelter of her lordship's house and the care of the staff.

In the future, such roles will be reversed. You may have seen a cotton gin or a spinning ginny. Such mechanical devices quickly perform the tedium that had been manual labor in the past. In the future, such devices will take over nearly all the labor of tilling, sewing, and harvesting crops. Much of the labor that will remain for the lower classes to do will be performed indoors, protected from the sun, while only the wealthy will have the spare time for such activities for swimming at the beach or exploring the wilderness. As these out-of-doors activities - and the tanned skin that comes with them - will signify membership of a higher class with spare leisure time, others will seek to imitate it. Those who cannot afford a boat, or a trip to the carribean islands, or countless days lounging in the garden will imitate the effect with a stain applied as a fine mist to their skin, toning their pale, lower-class, indoors-bound skin to the deeper tan that the wealthier classes can afford naturally.

In a final twist of irony, it will be found that such exposure to the sun can be dangerous to one's health, leading to unnatural and deadly growths of the skin. So it will be that even the wealthy who choose to spend time in the sun will apply lotions to block its effects, only to imitate those effects with the sprayed dye anyway.

In the future, white girls will copy the styles of black girls and black girls will copy those white girls copying the very same black girls. This means that black guys need to become more white, and white guys need to be more black. It's a terribly confusing hexaflexagon of stupid trends and foolish people, really.

~~If you are anything BUT 5 years old, and you're confused by something, this is the place for you.~~
Now that /r/eli5 clarified that they want simple explanations, (fake) 5 YEAR OLDS ARE NOW WELCOME TO THE SUBREDDIT. But not in a creepy way.